Its not hard, just need to get the cut out sills, that's what I'm waiting for. I talked to a local laser cutting shop here in town and they quoted me around 125.00 to cut the letters out. You might want to start calling around to see who does it in your area, you can send them this picture as a start.
The person I am getting the cut out sills from is going to list them on eBay once I get them and show him the finished product. Well at least that is the plan. I don't know what the price is going to be.
Still much cheaper than spending over $512.00 on line for the OEM's. Part number: VPLCS0286LAA
What I think is nice about doing these is that you can pick any colors LED's that you want, and not be stuck with the OEM Whites!!!